Polylepis racemosa / Aboveground biomass
Polylepis racemosa AGB from stem diameter at 50 cm (model 6)
© Jim Morefield · CC BY · iNaturalistAs printed (Results, text under Figura 8)
In this library's units, ready to compute (kg)
Aboveground biomass = exp(2.394988 + 0.082807 * D50)D50- Stem diameter at 50 cm, cm
Uses D50, the stem diameter 50 cm above ground (new canonical variable D50, cm), not DBH. Exponential (not power) form: ln(biomass) is linear in D50. Fitted on 11 destructively sampled trees, one per diameter class, D50 7,5–36,2 cm, total height 1,8–7,0 m; samples oven-dried at 105 °C. The listed D50 values of the sampled trees equal the class marks of Tabla 1, so they may be class midpoints rather than measured diameters. Undergraduate thesis, small sample: use with caution.
https://repositorio.unach.edu.pe/items/e9ea63fa-d11a-43dc-865b-b70102fd3bcc · Open access · copy we read
Las medidas dasométricas del diámetro 50 centímetros (D50), altura total (ht), número de ramas (NR) y diámetro de copa (DC) de los 11 árboles de Polylepis racemosa
La marca de clase de D50 centímetros (Figura 4), se distribuye desde 7,5 a 36,2
- Trees measured
- 11
- R²
- 0.932
- Method
- OLS on ln(biomass) vs D50 (model 6 of 10 tested); no correction factor reported
- Where
- Relict forest, Bella Andina community, Chota, Cajamarca, Peru
- Last checked
- 2026-11-01
On every build, the library's form and the paper's own form (in its units) must both give these values within 1%.
| Inputs | Expected | We get | From |
|---|---|---|---|
| D50 = 21.6 | 65.6 | 65.6 | Computed from the printed form computed from the published form; Tabla 3 tree F (D50 21,6 cm) weighed 59,723 kg |
| D50 = 36.2 | 220 | 220 | Computed from the printed form computed from the published form; Tabla 3 tree K weighed 186,968 kg |
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